It's been said time and time again that one of the best ways to promote your website is to post in other forums and link to your site in your signature. Many other people, myself included, frequently visit various webmaster forums out there (such as this one) and ask for site reviews or such.
When can this do more harm than good? We all know that one of the best ways to make a successful site is to have something unique and creative. So why go into depth about this original idea of yours in a webmaster forum where everyone else is out to find a creative idea and has the means of and skills to copy you?
Is it really counterproductive? Or is it one of the best ways to succeed?